Four years after millionaire Republican presidential candidate Mitt Romney’s tax returns caused controversy for his campaign, a much wealthier candidate has his sights set on the 2016 GOP nomination. In a recent Fox News Channel interview, Romney asserted that Trump’s financial records could be a bigger problem than his own.

“Frankly,” he told Your World host Neil Cavuto, “I think we have good reason to believe that there’s a bombshell in Donald Trump’s taxes.”

Though he did not pinpoint which anomaly he expects to find, the former Massachusetts governor did offer a few predictions.

“Either he is not anywhere near as wealthy as he says he is,” Romney said, “or he hasn’t been paying the kind of taxes we would expect him to pay, or perhaps he hasn’t been giving money to the vets or the disabled like he has been telling us he’s been doing.”

He said he based his speculation on Trump’s reaction when asked about his taxes.

“The reason I think there is a bombshell in there is because every time he is asked about his taxes, he dodges and delays and says, ‘Well, we’re working on it,'” Romney explained. “Hey, we’re not talking about the taxes that are coming due this year. Of course they’re working on those; they won’t be ready for months. We are talking about taxes already filed — back taxes.”

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Romney has previously called on each of the 2016 GOP hopefuls to release their tax records, though he is obviously more interested in Trump’s than the other candidates remaining in the race.

4 years ago today, I released my taxes; became issue. 2016 candidates should release taxes before first contests.